MPD: thread/PosixMutex.hxx Source File

MPD 0.20.15

PosixMutex.hxx
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1 /*
2 * Copyright (C) 2009-2015 Max Kellermann <max.kellermann@gmail.com>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the
14 * distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
19 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
20 * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27 * OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #ifndef THREAD_POSIX_MUTEX_HXX
31 #define THREAD_POSIX_MUTEX_HXX
32
33 #include <pthread.h>
34
38 class PosixMutex {
39 friend class PosixCond;
40
41 pthread_mutex_t mutex;
42
43 public:
44 #ifdef __GLIBC__
45 /* optimized constexpr constructor for pthread implementations
46 that support it */
47 constexpr PosixMutex():mutex(PTHREAD_MUTEX_INITIALIZER) {}
48 #else
49 /* slow fallback for pthread implementations that are not
50 compatible with "constexpr" */
51 PosixMutex() {
52 pthread_mutex_init(&mutex, nullptr);
53 }
54
55 ~PosixMutex() {
56 pthread_mutex_destroy(&mutex);
57 }
58 #endif
59
60 PosixMutex(const PosixMutex &other) = delete;
61 PosixMutex &operator=(const PosixMutex &other) = delete;
62
63 void lock() {
64 pthread_mutex_lock(&mutex);
65 }
66
67 bool try_lock() {
68 return pthread_mutex_trylock(&mutex) == 0;
69 }
70
71 void unlock() {
72 pthread_mutex_unlock(&mutex);
73 }
74 };
75
76 #endif
PosixMutex::PosixMutex
PosixMutex()
Definition: PosixMutex.hxx:51
PosixCond
Low-level wrapper for a pthread_cond_t.
Definition: PosixCond.hxx:42
PosixMutex
Low-level wrapper for a pthread_mutex_t.
Definition: PosixMutex.hxx:38
PosixMutex::operator=
PosixMutex & operator=(const PosixMutex &other)=delete
PosixMutex::try_lock
bool try_lock()
Definition: PosixMutex.hxx:67
PosixMutex::~PosixMutex
~PosixMutex()
Definition: PosixMutex.hxx:55
PosixMutex::unlock
void unlock()
Definition: PosixMutex.hxx:71
PosixMutex::lock
void lock()
Definition: PosixMutex.hxx:63